JP2002036051A - Shrinkage fitting and shrinkage removing device of tool for machine tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a shrinkage fitting and shrinkage removing device of a tool for machine tool capable of remarkably increasing a machining efficiency by automating the shrinkage fitting and shrinkage removing operations of a tool into and from a shrinkage fitting holder fitted to a machine tool such as a machining center. SOLUTION: This shrinkage fitting and shrinkage removing device of the tool for machine tool, comprising a tool magazine having a tool transfer station and a plurality of tools to be set thereinto, a tool changer for transfering a specified tool between the tool transfer station and shrinkage fitting and shrinkage removing station of the tool magazine, a holder transfer means such as a robot for transfering a tool holder between the head of the machine tool and the shrinkage fitting and shrinkage removing station, and a high frequency induction heater for high frequency induction heating the tool holder set into the station by supplying a high frequency current to a heating coil disposed in the shrinkage fitting and shrinkage removing station.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to shrink-fitting of a tool for a machine tool, for example, in a machine tool such as a machining center, in which a predetermined tool is shrink-fitted or punched into a holder mounted on a head of the machine tool. It relates to a punching device.

[0002]

2. Description of the Related Art In general, various heads of a machine tool such as a machining center which automatically processes a work are provided with a tool holder for attaching and detaching a number of various tools including an end mill including a drill. As this tool holder, a shrink fit holder for mounting the tool in a shrink fit manner is used.

[0003] Conventionally, in such a machine tool, a predetermined tool is taken out from a tool magazine in which a large number of tools are set by a tool changer, and the tool is heated by a shrink fit device having a predetermined heater. While doing
It is common to shrink fit in a predetermined shrink fit holder or to perform blanking.

[0004]

However, in such a method for shrink-fitting a tool, the tool is attached to and detached from a shrink-fit holder by a shrink-fitting device which is separate from the machining center and operates independently. Therefore, even if tools and shrink fit holders are exchanged by robots,
The shrink fit operation is similar to the so-called manual operation,
There is a problem that workability is extremely poor, and as a result, there is a limit to improving the processing efficiency by the machining center.

[0005] The present invention has been made in view of such circumstances, and by automating the shrink-fitting of a tool to a shrink-fit holder mounted on a machine tool such as a machining center, the processing efficiency is greatly increased. Another object of the present invention is to provide a shrink-fit printing apparatus for a tool for a machine tool which can be improved.

[0006]

According to one aspect of the present invention, there is provided a tool magazine having a tool transfer station and having a plurality of tools set therein, and a tool magazine of the tool magazine. A tool changer for transferring a predetermined tool between the transfer station and the shrink-fit printing station; holder transfer means for transferring a tool holder between the head of the machine tool and the shrink-fit printing station; A high-frequency induction heating device for supplying a high-frequency current to a heating coil disposed in the shrink-fitting and baking station to perform high-frequency induction heating on a tool holder set in the station.

[0007] The holder delivery means is preferably formed by a robot which operates in association with the operation of the machine tool, as in the invention of claim 2. As in the invention described in 3,
It is preferable to be set beforehand at the shrink-fitting / blanking station or set at the station by a coil moving device.

With this configuration, when a tool is shrink-fitted into a shrink fit holder of a machining center, for example, a predetermined tool set on a tool magazine is removed by a tool changer at a tool transfer station. It is set in the shrink fit printing station. A predetermined shrink-fit holder is set in the shrink-fitting baking station by holder transfer means, and the tool removed by the tool changer is shrink-fitted while the holder is induction-heated by the high-frequency induction heating device. You. The shrink fit holder on which the predetermined tool is shrink-fitted is mounted on the head of the machining center by holder transfer means, and the work is processed by the tool. The shrink-fitting of the tool shrink-fitted in the shrink-fit holder is performed in substantially the same procedure as that of the shrink-fitting, whereby the shrink-fitting and the shrink-fitting are automated.

[0009] By forming the holder transfer means with a robot operating in association with the operation of the machine tool, the shrink-fit printing operation is made more efficient, and the heating coil is transferred to the shrink-fit printing station. By pre-setting or by setting the station with a coil moving device, the tool holder is more effectively induction heated by the heating coil.

[0010]

Embodiments of the present invention will be described below in detail with reference to the drawings. In FIG. 1, a shrink-fit printing apparatus 1 includes a tool magazine 3 on which a large number of tools 2 are set, a tool transfer station S1 of the tool magazine 3, and a shrink-fit printing station S2.
, A robot 6 serving as a holder transfer means disposed between a head 5a of a machine tool 5 such as a machining center and a shrink-fit printing station S2, and shrink-fit printing. The high-frequency induction heating device 7 disposed in the station S2 and the motors 8 to 8 for the tool magazine 3 and the tool changer 4
Control device 1 for controlling the high frequency induction heating device 7 and the like
2 and so on.

The tool magazine 3 is, as shown in FIG.
A large number of tools 2 (each tool 2 is shown in the same shape in the figure, but the shape of each tool 2 is actually different) in the casing 13, but along the traveling path 14 by the operation of the motor 8 (see FIG. 1). A tool transfer station S1 is provided on one side of the traveling path 14. Although the tool magazine 3 is formed so that the tool 2 travels in a horizontal traveling plane, for example, a configuration in which the tool 2 travels in a vertical traveling plane may be adopted.

A tool changer 4 is disposed in the S1 portion of the tool transfer station. The tool changer 4 includes a changer frame 15
The chuck 16 is provided on both sides of the changer frame 15 such that the chuck 16 can move forward and backward as shown by an arrow A in FIG. The changer frame 15 is disposed so as to be able to advance and retreat as shown by the arrow B with respect to the housing 13 of the tool magazine 3 by the operation of the motor 9, and to be rotatable as shown by the arrow C by the operation of the motor 10. ing.

The robot 6 has a head 5 of a machine tool 5.
A shrink fit holder 17 (as a tool holder) set as a tool holder set on a rack or the like of the machine tool 5 (or in the vicinity thereof) is used, which has an appropriate structure that moves between the portion a and the shrink fit printing station S2. 1) is attached to and detached from the head 5a of the machine tool 5, and a predetermined shrink fit holder 17 is set in the shrink fit printing station S2 for shrink fitting, and And the shrink fit holder 17 in which the tool 2 is shrink fitted.
Is set in the shrink-fitting and printing station S2. The form of the robot 6 as the holder transfer means may be a separate form from the machine tool 5 or may be integrated with the head 5a of the machine tool 5 (the head itself operates as a robot). Of course, it is also possible to use such a method.

As shown in FIG. 1, the high-frequency induction heating device 7 includes a transistor inverter 18 and a heating coil 1.
9 and a coil moving device 20. The transistor inverter 18 includes, for example, an inverter circuit (not shown) using a semiconductor switching element such as a MOSFET or an IGBT, an output transformer (current transformer), and the like.
A high-frequency current having a predetermined output of about
It is configured to be able to output to

The heating coil 19 has a pair of coil portions formed in a substantially semicircular arc shape in plan view by bending a copper pipe, for example. They are arranged at a predetermined distance from the surface. In addition, by moving at least one of the pair of coil units by the coil moving device 20, the area of the inner space formed by the pair of coil units is increased, and the shrink fit holder 17 is set. Is set to be easier. Note that the shape of the coil portion of the heating coil 19 is not limited to this example. For example, coil portions having various shapes substantially corresponding to the outer shape of the shrink fit holder 17 such as a substantially triangular shape in plan view may be used. it can.

In this example, the heating coil 19 is divided into two parts, and at least one of the coil parts is moved by the coil moving device 20 to set the shrink-fit holder 17 in the shrink-fit printing station S2. However, for example, the heating coil 19 may be formed in a circular shape in a plan view, and the shrink-fit holder 17 may be inserted and removed from above or below the heating coil 19. In this case, In addition, the coil moving device 20 becomes unnecessary. Further, although not shown, the transistor inverter 1
8, a cooling device is integrated, and the cooling water is supplied to a heat radiating plate in the transistor inverter 18 and a copper pipe of the heating coil 19 to suppress the heat generation thereof.

Next, an example of the operation of the shrink-fit printing apparatus 1 will be described with reference to the process chart of FIG. First, when a machining operation is started (K100), a tool 2 to be used is used.
The shrink fit holder 17 is automatically selected (K101) by the controller 12 based on a machining program or the like. When the tool 2 or the like is selected, the motor 8 of the tool magazine 3 is operated by a control signal from the control device 12 (K102).
Then, the selected tool 2 is set at the position of the tool transfer station S1, and the predetermined shrink fit holder 17 used in the machine tool 5 is set at the shrink fit printing station S2 by the robot 6 (K200). I do. The shrink fit holder 17 is set, for example, in a state where the shrink fit hole is opened upward and is positioned at the center of the heating coil 19.

The tool 2 set in the tool transfer station S1 by the operation of the tool magazine 3 is:
When the motor 9 rotates, for example, forward by a control signal of the control device 12, the tool changer 4 advances and chucks the tool 2 set in the tool transfer station S1 (K103). 4 retreats (K104). When the tool changer 4 is retracted, the motor 10 is rotated by a control signal of the control device 12 to move the tool changer 4 in a horizontal plane by 9 degrees.
Rotate by 0 degree (K105).

When the tool changer 4 is set in a predetermined direction by the rotation, the tool changer 4 advances by the operation of the motor 11 and the tool 2 being chucked by the chuck 16 is held in the shrink fit holder in the heating coil 19. 17 (K106). At this time, the shrink fit holder 17 is set by the robot 6 at a predetermined position of the shrink fit baking station S2 in step K200 with the shrink fit hole opened upward, and one of the heating coils 19 The part is retracted by the operation of the coil moving device 20, and the setting of the tool 2 can be easily performed.

When the tool 2 is set in the heating coil 19, the coil moving device 20 is actuated by the control signal of the control device 12, one of the coil portions moves forward, and the heating coil 19 is set at a predetermined position (K107). ) Is done. Then, in a state where the heating coil 19 is set, the transistor inverter 18 is operated by a control signal of the control device 12 (K108), and a high-frequency current is supplied to the heating coil 19 for a predetermined time. By the supply of the high-frequency current to the heating coil 19, an eddy current is induced in the shrink fit holder 17, and the shrink fit hole portion is induction-heated, the inner diameter of the hole is widened, and the tool 2 inserted to the stopper position Is inserted into the shrink fit hole.

When a high-frequency current is supplied to the heating coil 17 for a predetermined period of time, the coil section is retracted by operating the coil moving device 20 to return to the initial position (K109), and the tool changer 4 is returned to the initial position (K110). ). Thereby, the tool changer 4 and the heating coil 1
9 returns to the original position, and the shrink fit operation is completed (K112) by cooling the shrink fit holder 17 that has been induction-heated by natural cooling or forced cooling with a cooling medium or the like (K112). The holder 17 is chucked and moved by the robot 6 and mounted on the head 5a of the machine tool 5 (K201). Then, the processing of the workpiece is started by the tool 2 mounted on the head 5a (K20).
2) will be done.

On the other hand, when the tool 2 shrink-fitted in the shrink-fit holder 17 is to be punched out, it can be basically performed in the same manner as the shrink-fitting operation. Note that the process in this example is merely an example, and the process can be appropriately changed, for example, the tool changer 4 can be returned to the initial position immediately after the K106 is set.

In this example, only one chuck 16 of the tool changer 4 has been described. For example, as shown by a two-dot chain line in FIG. It is also possible to arrange them so as to correspond to both chucks 16 and to perform shrink-fitting and baking-out substantially simultaneously (substantially parallel). In this way, the replacement work of the tool 2 is performed more efficiently. Further, the present invention is preferably applied to a machine tool 5 such as a machining center using various tools 2 and a shrink fit holder 17, but can of course be applied to a general machine tool.

[0024]

As described above in detail, according to the first aspect of the present invention, a tool for a machine tool such as a machining center is shrink-fitted to a tool holder such as a shrink-fit holder by high-frequency induction heating. Since it can be burned out, it is possible to automate the shrink-fitting and blanching work, and it is also possible to accurately and quickly and safely change tools with the use of induction heating. Can be greatly improved.

According to the second aspect of the present invention, in addition to the effect of the first aspect, the holder transfer means is formed by a robot which operates in association with the operation of the machine tool. The replacement work can be fully automated,
The processing efficiency can be further improved.

According to the third aspect of the invention, in addition to the effects of the first or second aspect, the heating coil is
Pre-set at the shrink-fitting baking station,
Alternatively, since the coil is set in the station by the coil moving device, the setting operation of the heating coil is made more efficient, and the heating coil can effectively heat the tool holder.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram showing an embodiment of a shrink-fitting and burning-out apparatus for a tool for a machine tool according to the present invention.

FIG. 2 is a perspective view of the tool magazine.

FIG. 3 is a process diagram illustrating an example of the operation.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Shrink-fitting and baking apparatus 2 Tool 3 Tool magazine 4 Tool changer 5 Machine tool 5a Head 6 Robot 7 High-frequency induction heating device 8-11 Motor 12 Control device 16 Chuck 17 Shrink-fit holder 18 Transistor inverter 19 Heating coil 20 Coil movement Equipment S1 Tool delivery station S2 Shrink fit printing station

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3C002 AA00 DD00 GG00 HH01 KK04 LL01

Claims (3)

[Claims] 1. A tool magazine having a tool transfer station on which a plurality of tools are set, a tool changer for transferring a predetermined tool between the tool transfer station and the shrink-fit printing station of the tool magazine, Holder transfer means for transferring a tool holder between a head of a machine tool and the shrink-fit printing station, and a high-frequency current supplied to a heating coil arranged at the shrink-fit printing station to be set in the station And a high-frequency induction heating device for high-frequency induction heating of the tool holder. 2. An apparatus according to claim 1, wherein said holder transferring means is formed by a robot which operates in association with the operation of the machine tool. 3. The machine tool according to claim 1, wherein the heating coil is set in advance in the shrink-fitting / blanking station or is set in the station by a coil moving device. Tool shrink-fitting device.